It is important to develop a low-cost and easy-prepared electrocatalyst for hydrogen evolution reaction. In this work, MoS₂/NiS hierarchical nanostructures (HHs) were fabricated on Ni foam by a simple one-step hydrothermal reaction using Ni foam as raw materials directly. Owing to the unique synthetic strategy that provide uniform MoS₂/NiS HHs structure on the porous Ni foam, generate abundant active surfaces, small resistance, furthermore it is beneficial for carrier migration and contributing to a large number of active sites. Excellent electrocatalytic performances are obtained such as an overpotential of only ~84.1 mV to reach the current density of 10 mA cm⁻², a Tafel slope of 76.9 mV dec⁻¹ and a small inherent resistance of 6.33 Ω. More importantly, a quick current response under multistep potentials is realized and an excellent stability retained after 3000 cycles of CV test. Besides, a DC power to supply a device (MnMoO₄//MoS₂/NiS HHs B) under 1.6 V can generate a current density of 21 mA cm⁻², demonstrating its practical application.

开发用于氢释放反应的低成本且易于制备的电催化剂是重要的。在这项工作中，通过直接使用镍泡沫为原料的简单一步水热反应，在镍泡沫上制备了MoS ₂ / NiS分层纳米结构（HHs）。由于独特的合成策略，可以在多孔镍泡沫上提供均匀的MoS ₂ / NiS HHs结构，产生丰富的活性表面，电阻较小，此外，它对载流子迁移有利，并有助于形成大量活性位点。获得了出色的电催化性能，例如仅约〜84.1 mV的超电势即可达到10 mA cm ^-2的电流密度，Tafel斜率为76.9 mV dec ^-1固有电阻为6.33Ω。更重要的是，在多步电势下实现了快速的电流响应，并且在3000次CV测试后仍保持了出色的稳定性。另外，在1.6V下向器件（MnMoO ₄ // MoS ₂ / NiS HHs B）供电的直流电源可以产生21mA cm ^-2的电流密度，证明了其实际应用。